Intensity controlling circuit device for LED-array head having a

Details Intensity controlling circuit device for LED-array head having a Intensity controlling circuit device for LED-array head having a

1995-10-20

1998-09-29

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

External effect

Light

327515, 327530, 347132, 347237, H01L 3000

Patent

active

058150250

ABSTRACT:
An intensity controlling circuit device can correct variation in intensity of light beams, due to tolerance occurred in each of a plurality of LED-array chips, emitted by LEDs provided in each of the LED-array chips. The intensity controlling circuit device is connected to at least one LED-array chip comprising a plurality of LEDs and slave transistors corresponding to each of the LEDs. The intensity controlling circuit device comprises an intensity controlling circuit connected to the respective LED-array chip. The intensity controlling circuit comprises a first transistor provided between a power source and a constant current generating unit so as to supply a current to the LED-array chip, and an intensity adjusting unit having a second transistor connected to the first transistor in parallel and a controlling unit for controlling the on/off state of the second transistor. An output of the intensity controlling circuit is connected to each of the slave transistors provided in the LED-array chip, and the second transistor is turned on/off by the controlling unit so that a current flowing in each of the LEDs is adjusted to a predetermined value.

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